U.S. Air Force airman marshals an F-16 Fighting Falcon aircraft at the 86th Air Base Romania
A U.S. Air Force airman marshals an F-16 Fighting Falcon aircraft assigned to the 480th Fighter Squadron, at the 86th Air Base near Fetesti, Romania, February 17, 2022. Picture taken February 17, 2022. U.S. Air Force/Senior Airman Ali Stewart/Handout via REUTERS. Reuters

U.S. President Joe Biden's administration is set to move ahead with the sale of a modernization package for Turkey's existing F-16 aircraft, after leaders of U.S. congressional committees gave informal approval for the deal, sources familiar with the matter said.

The U.S. State Department could send the formal notification for the sale, which includes radars and avionics, as early as Monday, the sources said.

If it is cleared by Congress during the formal approval process, the package would be the first major military sale to Turkey that Congress has approved for years.

The State Department, which typically declines comment on pending arms sales, did not immediately respond to a request for comment. The Democratic and Republican leaders of the Senate Foreign Relations and House Foreign Affairs committees, who would have had to clear the modernization package, declined comment.

The sources, one U.S. official and another familiar with the matter, could not give a precise value for the deal, beyond saying that it would be in the millions of dollars. It follows Turkey approving Finland's accession to the NATO military alliance and signs of easing tensions between Turkey and neighbor Greece ahead of Turkish elections due on May 15.

The package is separate from the proposed $20 billion sale of new Lockheed Martin Corp F-16 fighters and nearly 80 modernization kits that Turkey requested in October 2021.

Several U.S. lawmakers have resisted the larger package, citing issues including Ankara's opposition to Sweden's accession to NATO, Turkey's policy on Syria and tensions with Greece.

Turkish Defence Minister Hulusi Akar gets off from an Air Force F16 jet after landing at a new airport under construction in Istanbul
Turkish Defence Minister Hulusi Akar gets off from an Air Force F16 jet after landing at a new airport under construction in Istanbul, Turkey September 22, 2018. Reuters